05.31.07 | APR vs APY?
Banks and credit card companies are very clever. They try and make their offers as enticing as possible for those who are interested in their “wares”. You may see a “5.99 introductory APR” for a credit card. So how does that compare to an APY?
It’s actually pretty simple. APR stands for Annual Percentage Rate and refers to the amount of interest you pay each month on your balance. So, if you had a $1,000 balance, at the end of the year your balance would be $1,200. Easy, right? Actually, no, that amount isn’t correct, provided your interest accrues monthly.
This is where APY (Annual Percentage Yield) comes into play. If you were to divide 20% by 12 pay periods, you get 0.016. You would then multiply the 0.016 by the $1,000, which equals $16. This is how much interest you owe after the first month. The second month’s balance is no longer $1,000 – it’s $1,016. So, you’d multiply 0.016 by $1,016, which equals $16.26. By the end of the year your total would actually be a bit higher than if you used the APR – it’s $1,210.
A simple formula for calculating APY is
:
First, provided your interest accrues monthly, get the monthly percentage rate (APR = Monthly Rate X 12).
Then, use this formula:
APY= (1 + Monthly Rate) ^ Months per year – 1
Some simple computation gets you the answer I arrived at above.
So, make sure you keep the APR/APY in mind when calculating the interest you’re accruing on your credit card.
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